I have a large vibratory tumbler, 18" bowl. I have been using it for years both wet and dry for machined parts. Anyway I have cleaned it out and going to use it for cases. I stopped at the china depot (harbor freight) and picked up walnut shells. This is listed for blasting and tumbler. Is this the stuff you guys are using? Do I need to add any kind of a burnishing or cleaning detergent?

__________________Concentrated power is not rendered harmless by the good intentions of those who create it.Milton Freidman"If you find yourself in a fair fight,,,
Your tactics suck"- Unknown